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Adapted by Nelson Nuñez-Rodriguez
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Unless otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Chapters derived from:
By David W. Ball
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CC BY-NC-SA
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| QUESTION | ANSWER |
|
1. Define rad. |
1. a unit of radioactive exposure equal to 0.01 J of energy per gram of tissue |
|
3. How does a becquerel differ from a curie? |
3. A becquerel is 1 decay/s, whereas a curie is 3.7 × 1010 decays/s. |
|
5. A sample of radon gas has an activity of 140.0 mCi. If the half-life of radon is 1,500 y, how long before the activity of the sample is 8.75 mCi? |
5. 6.0 × 103 y |
|
7. If a radioactive sample has an activity of 65 µCi, how many disintegrations per second are occurring? |
7. 2.41 × 106 disintegrations per second |
|
9. A sample of fluorine-20 has an activity of 2.44 mCi. If its half-life is 11.0 s, what is its activity after 50.0 s? |
9. 0.104 mCi |
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11. How long does it take 100.0 mCi of fluorine-20 to decay to 10.0 mCi if its half-life is 11.0 s? |
11. 36.5 s |
|
13. Describe how a radiation exposure in rems is determined. |
13. by using a film badge, which is exposed by the radiation, or a Geiger counter |
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15. Use Table 6.4 "Effects of Short-Term Exposure to Radioactivity and Radiation" to determine which sources of radiation exposure are inescapable and which can be avoided. What percentage of radiation is unavoidable? |
15. Radioactive atoms in the body, most terrestrial sources, cosmic sources, and nuclear energy sources are likely unavoidable, which is about 27% of the total exposure. If exposure to radon gas is added, the total unavoidable exposure increases to 82%. |
|
17. Explain how a film badge works to detect radiation. |
17. Film is exposed by the radiation. The more radiation film is subjected to, the more exposed it becomes. |